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A High Efficiency Spread Spectrum Scheme Using Approximate Orthogonal Complex Sequences

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DOI: 10.4236/ijcns.2010.31011    5,931 Downloads   9,459 Views  
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ABSTRACT

This paper presents a high efficiency spread spectrum scheme using approximate orthogonal complex (AOC) sequences. In this scheme, the 64 AOC sequences picked up from 84 complex sequences space are employed for spreading spectrum. In modulation, 6 input bits is used to select one AOC sequence, and the selected sequence is then phase-rotated by another 2 input bits. In demodulator, a complex correlator detects the transmitted AOC sequence. Simulation results show that the proposed scheme has better BER performance than the existing complementary code keying (CCK) modulation scheme. For AOC, additional processing gain of 1.79dB can be obtained when the sequence length is 8.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

X. SHI, "A High Efficiency Spread Spectrum Scheme Using Approximate Orthogonal Complex Sequences," International Journal of Communications, Network and System Sciences, Vol. 3 No. 1, 2010, pp. 79-82. doi: 10.4236/ijcns.2010.31011.

References

[1] A. J. Viterbi, “CDMA: Principles of spread spectrum communication,” Prentice Hall, ISBN: 0201633744, April 1995.
[2] X. W. Zeng, et al., “Influences of PN code correlative characteristics on tamed spread spectrum,” ACTA Electronica SINICA, Vol. 25, September 1997.
[3] C. Andren and M. Webster, “CCK modulation delivers 11Mbps for high rate IEEE 802.11 Extension,” Wireless symposium/portable by design conference, Spring 1999.

  
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